Avi Networks Ansible modules. (#20415)

* Avi Networks Ansible modules.
Avi Version: 16.3.4

* Fixed Review comments
1. Changed description to be full sentences
2. Fixed Pep8 warnings.
3. Fixed comments and descriptions.

* 1. Fixed descriptions and messages as per review comments.
2. Added descriptions for the missing parameters.

* Fixed the shippable break due to the incorrect description format

* Removed the extra modules so that there is a single module for the first commit

* Updated license to BSD based on review comments

* updated comments based on review feedback

* Refactored code to handle POST and PUT scenarios where playbook does not need to check whether object is present.
Moved ansible helper utilities to module_utils as now roles can be patched with module_utils as well.

* fixed pep8 warnings

lib/ansible/utils/module_docs_fragments/avi.py

@@ -0,0 +1,45 @@
+#
+# Created on December 12, 2016
+# @author: Gaurav Rastogi (grastogi@avinetworks.com)
+# Avi Version: 16.3.4
+#
+#
+# This file is part of Ansible
+#
+# Ansible is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Ansible is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+
+class ModuleDocFragment(object):
+    # Avi common documentation fragment
+    DOCUMENTATION = """
+options:
+    controller:
+        description:
+            - IP address or hostname of the controller. The default value is the environment variable C(AVI_CONTROLLER).
+    username:
+        description:
+            - Username used for accessing Avi controller. The default value is the environment variable C(AVI_USERNAME).
+    password:
+        description:
+            - Password of Avi user in Avi controller. The default value is the environment variable C(AVI_PASSWORD).
+    tenant:
+        description:
+            - Name of tenant used for all Avi API calls and context of object.
+        default: admin
+    tenant_uuid:
+        description:
+            - UUID of tenant used for all Avi API calls and context of object.
+        default: ''
+"""